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<?php $selectedCats = [2,4,6]; array_walk($selectedCats, function (&$cat) { return $cat * 2; }); var_dump($selectedCats);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> int(2) [1]=> int(4) [2]=> int(6) }

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